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c# winform TreeView控件中实现拖拽的功能 (一)

2012年10月05日 ⁄ 综合 ⁄ 共 2475字 ⁄ 字号 评论关闭

 using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace TreeViewTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            TreeNode node;
            int x, y;
            for (x = 0; x <= 3; x++)
            {
                node = tvwTest.Nodes.Add(string.Format("根结点{0}", x * 4));
                for (y = 1; y <= 4; y++)
                {
                    node = node.Nodes.Add(string.Format( "-节点", x * 4 + y));
                }
            }
        }

        private void tvwTest_ItemDrag(object sender, ItemDragEventArgs e)
        {
            if (e.Button == System.Windows.Forms.MouseButtons.Left)
            {
                DoDragDrop(e.Item, DragDropEffects.Move);
            }
            else if (e.Button == System.Windows.Forms.MouseButtons.Right)
            {
                DoDragDrop(e.Item, DragDropEffects.Copy);
            }
        }

        private void tvwTest_DragEnter(object sender, DragEventArgs e)
        {
            e.Effect = e.AllowedEffect;
        }

        private void tvwTest_DragOver(object sender, DragEventArgs e)
        {
            Point targetPoint = ((TreeView)(sender)).PointToClient(new Point(e.X, e.Y));
            ((TreeView)(sender)).SelectedNode = ((TreeView)(sender)).GetNodeAt(targetPoint);
        }

        private void tvwTest_DragDrop(object sender, DragEventArgs e)
        {
            Point targetPoint = ((TreeView)(sender)).PointToClient(new Point(e.X, e.Y));
            TreeNode targetNode = ((TreeView)(sender)).GetNodeAt(targetPoint);
            TreeNode draggedNode = (TreeNode)(e.Data.GetData(typeof(TreeNode)));
            if (!draggedNode.Equals(targetNode) && !ContainsNode(draggedNode, targetNode))
            {
                if (e.Effect == DragDropEffects.Move)
                {
                    draggedNode.Remove();
                    targetNode.Nodes.Add(draggedNode);

                }
                else if (e.Effect == DragDropEffects.Copy)
                {
                    targetNode.Nodes.Add((TreeNode)(draggedNode.Clone()));
                }
                targetNode.Expand();
            }

        }
        private bool ContainsNode(TreeNode nodel, TreeNode node2)
        {
            if (node2.Parent == null)
            {
                return false;
            }
            if (node2.Parent.Equals(nodel))
            {
                return true;
            }
            return ContainsNode(nodel, node2.Parent);
        }
      
    }
}

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